I just spent a summer grinding a hull of a 25 footer. There are voids in there. This year's vinylester will be way better than 40 year old poly- I suspect you are fine. But sections that are white might mean you are a bit dry. I found that the vipel vinylester is runny enough to flow out of the cloth. I found it fairly easy to dry out the cloth when using peel ply and vinylester. I wound up floating the excess resin on top of peel ply worked for me. Especially on vertical surfaces. Mixing at 1.5-2% MEKP helped, too, but the gel doesn't sneak up on you. It hits like a freight train. From liquid to molasses in 60 seconds. 15 minute pot life.
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